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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d0984c033939a6ecd272ec79d6b2c5fab1370ea7dd8aae1e119fcb6cc921f10' 
  AND token = 'kcl902ptj8GkUsRsX4G5VyHsEGoSvKe8ba2FtuQFftA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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