SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e7a11971d6f5f1502b2a11e59787f1a9f41584c55f7a083b922edd36148d683' 
  AND token = '3uF/e7h7KEd+5PSwYpAXJLOdiLlGYXkG5zviThn3VN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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