Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b48463646a2f012d4eb31fff6defb48d24dc31ef728dcf071cdc4391f7ddf2b3' 
  AND token = 'Bfga1LUZGIpqZYH4rPez8x0kzEu2yoDE/sGOpv6Bvx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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