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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e974c5ac125b6f450b006f74f38a39e5dd50c7ec1d946a0d2c7182184a8bf5b' 
  AND token = 'J8J5++7xVMyg4Pe/X4SHE530/+leOHIfPIlBSpv1eCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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