SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '884936e719a2bbe869d48f1e331b2a7a1d172d0c08d3302b59ad51fc83f67f73' 
  AND token = 'u8pN8woqDvPRCefBL65DRYzfDt4iByXB2x2bbPVZnqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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