SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82db85c3c4da28e6e4778ddef61103f3cb2c85d0e3c90cd52d788e68a0c32001' 
  AND token = 'UzGbhrk1v7ZBdZOhf5dqG1v/szFJW1EXAukAoKhVwpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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