SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a07967cbc868b270068f2175a4832b3bc9a372bc79390a4613f01edb8a4a01eb' 
  AND token = 'J+MCvoCbvhBZcREMMAY2Hwq1TGzqLiJIpqLvov8YWIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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