SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a7065f25d9c112589995983e9bbd3fb8cb181357d6ee32831d134b475aaab62' 
  AND token = 'RFR6cNN37/HTP71FBpBYJTZsiChmdG/ovCT9QjDp7Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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