Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dc9ab8e000b5cc261e17c48a2efb593b020de2c3b2f496562eb80a1757b9283' 
  AND token = '6806uEARf1Ee62g6xBIWugowkoswcvhszl46YeUdIzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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