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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e210f57453aa353f8613b1efef2ae02145d0ce99ab89da909b07915412357523' 
  AND token = 'GxlYFRoUHH6e1uF5j9phSw9+oloijG7Ej4ktR+Av6mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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