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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad8992ad2d4baab5936efcc97813ef5ebb7977545d79f12c24adb7efd6d89190' 
  AND token = 'uFi+je2Om/X2oqDEbNQKnhveyUkjArur4Gvymvp/c+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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