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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dd0bc1bdf60c8979b6fa654d155faa3a7a34f1e05572f307ee7a9de9a875667' 
  AND token = '35Z4AtXNk/Xwq8pFNo94co+MpUWhgM3TKtQ5rTUYg/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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