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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96ed0963edc589471d71ad6325204a99a36a673a218a11e63bec1555537b55a6' 
  AND token = 'ChHQpZA0lgYPZ1GhmPRtOTRPTRQrcPlgNXBCrZeAYtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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