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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7fc08950c4b9fe0db9fedd0e5318afc485d8af82ed8f70328a146b6fa1b41a0' 
  AND token = '/F1qchTYVCIVyRlJwcrdRWuledsf8BKhtlHybJKkdqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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