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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33fb8e270d5375f5b31a583bb32c2dd7a346ddb39a2b6d57ec7387ca137e3cdd' 
  AND token = 'UEyP2UFGzbykslvcqcdSVRrc6hzWaK3LY+VcIUgIhBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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