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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1871d2bf40fc27d31ca09899c05a661bb4420d90e9adcbb66616dfee48441a3d' 
  AND token = 'KHSDSnRNLKa0EzJ0aEQxWqksmk1LGfXo6qiJZEsfo7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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