SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '120f067268de852f3d84de606571124dd7f4f0535931a93c73c547ee5a4c14a1' 
  AND token = '7xzn1kos5GMINcZY204JqnzuhB1ZFNHtUYBw8Ke2tHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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