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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8e81f359d7ea1470cc8e971b8f770056f034a6f471dc7a77965dbdba4ae0e6c' 
  AND token = 'SHbXqai1PYQJ1O5SVHSaVFUQmgo9D+wtZOMBuYQHXDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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