SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d5c19d6f28666b5f304d258785151e87c0eb32b2f9dce9db10f558d28c17789' 
  AND token = 'RwnE3VnvFl0wGqGyUmG6nQ7wzJgThsFLZ2GrXIXTktI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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