SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9a45b3c51f6d732b3a6580ba57360b6b5e01acbbd8bc8c95fe24aa707f6670f' 
  AND token = '+R4/iw0rgtKLYL3eqZPljBzeOCKCS0gm3oPdBcahoV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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