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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60318f79c87c69d1584a9598acfb8ab58eef3080c08b84812a58cd42a71fcea4' 
  AND token = 'HGXzqTlBuvOs6t3kph7aUZTQTHTpp7bBv1btL6igfXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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