Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b635c1ebb2185b32ecfe3c27e279ab592b8c4da4c9ea26cc5d40f3aa39c45f4b' 
  AND token = 'KlRitJZHIpl3LUEtfZRntxCK+HImfe+BTfmQk9YbO8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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