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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '051fcafc59b55028643d84e7e3c72abad20ecf6d9b1b4232d4097c3ce253e3af' 
  AND token = 'xHlI7RHriWC/LbVeqVjxSIdYWpOa90SFk8BXOsNFfss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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