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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '474e47633b31c9f009c50768561946d92c66cb67a13bc6f34f04a1060a333e6f' 
  AND token = 'XckSLSq0UaBAVn0Ma5QCsiS7P+qo0JlI94if/yWW3WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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