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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35b1db211ebc7a823473f8749a46130bb89950cf8e76a758e8b058f03f34f5fd' 
  AND token = '1sNSL/bjt9GeIWR3TPmJBkELr2M4IOkiX++W2yky7JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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