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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94aaf6b7f52a48b74a448ca99de1cedd4a15aff319380412906d44a2295c6c02' 
  AND token = 'LUd+8dCfeYHEkUYBoxwr0berQHODNYhiBvW4DKIifG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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