SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aaa174bafe4e561d975acb886ea83200557fd8b08dc696cd2de200793cc3601' 
  AND token = 'jFxqzKvycs36OFZHjgb1fI+m22SRYU7DHZ3nLNSkbaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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