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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7703dae817501bc4fc8b20e4e6db7673f635d10136f35cfcc0c7e2b2cd20443' 
  AND token = 'wXOREkl3WlXinXVYyzX8090J2me6YQ/83JhwJwv6qvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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