SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5da246630d47d1f2c602026c98f3c0301b45d5db462712a5aa8665def7229ab5' 
  AND token = 'oW0+/rHHI/pPN4H8Iv+jrJoxn4COw1bIgCblYWKQ6H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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