SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '936f8903b0341cb57d97faf81f1cc6c14a0af99af80c6032e11bd22e7d817732' 
  AND token = '2lhwSHqLcv2YMFN7S8ZfDSYgalzhPhb/o7SMhJJMGy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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