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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa549210ba44bc60b39fff63dda31f6fa66875009882dae7f8afe2b8b35a7afb' 
  AND token = 'p3MmpbLOExwK8lkoHYg9S7Y76SkndXnl7rc8+rKT5RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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