SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00cbf70a9762ac8f0296549f2a6f602d3a9378c98d1e7b2133218a28e0e681e4' 
  AND token = 'jrwmn+Q45l/fAh6NhR+dLxOD50CuTuotmNFutXBlwQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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