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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a659557d8c33b72397a240a78e8067b74216bc5b87ba2521a11749677a671e' 
  AND token = '4QulAtHJr098xjTAQk9B8yfmHI8yjOSsBkA5eGfHbUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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