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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfc683b8af5e79de87de8732019d766e4ee4b5a73ed844deb503554bd9713133' 
  AND token = 'J0A5ZRGRxjta8ZAxr8aD8ZFZz7YJ2zIYvJJGBKbRS0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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