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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1910ad1788b5080fc4da5cca8e14cff86cfa879c1ccbd97c9662d34c1414b99c' 
  AND token = 'T37WbRoZlxe633RD1xvydem5/oxdWcaDPnISeGyEbNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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