SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68ca51c25baa2f4d01787beaa9388b8de93c6a2457608ee6f356edc78ba91257' 
  AND token = 'hZvNW0AoJzus9rAlrGvtPODx/QYNnl5ROl++FiSr+Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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