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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce778c1015a26d7ccd5e2c0797bf29fe0a2ec9cbad92b097613ea20dd32704cc' 
  AND token = 'zaV1kGKije+g3A3OtR1riIoVCG2AgMay6rDxcsP68cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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