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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bdcbd620aa39cf2830f01d3ca0912ed5643a671f7e5bb5a4a990b27268abfdc' 
  AND token = 'NmZZcz98e3bQMiH8jCjzAyWXZdGYUWXcDX/pXyedRmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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