SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f795d63627d7690d213224d74af0f5b3419d1ae5b0232e2f668c91d0fc905a3' 
  AND token = 'qpCPXeKnq8x5VQG3K3V4/pp/gG30wpdxxcRtFuIPcUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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