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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b583779da7000596fee09129cf822cf8951698607f732deb171c1e891495687' 
  AND token = 'tb3EYkB8woeSauZb3fEgHUuvswJ9Ai7z7lnbqW/8fkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}