SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2d840a3a13ab1bf5e86ebb7482120e46351d9af5f02f05e069395fe6c554ffe' 
  AND token = 'pTxbJp94b+I+2DusnEL81gMOWAWV8vuxwh3SVYzFQ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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