SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fe41413a06a2d7d7b665e6b1878509a81473deba4079381e9973bfbf7772085' 
  AND token = 'XV5fctUNCxb4/udSiYHJ1ucrUUQkQ3KnehyS+p+dtjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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