SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48525448dc45495109dcf405f0915c969a4f605b15008e0e2b62d3ba7e30eb2e' 
  AND token = 'oLEwoErGqv0Y18Ws0HlJ4QSO4PqzX7VYg+lE+CfJvBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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