SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3aa90cf8ba2e3b105e0b5f22482de1e5bcb874899f660deb6121154a584780df' 
  AND token = 'TPYGs4LtDdKQpmwJ9cll7zbzMVQExUv0pcbn0vrB8KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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