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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '240e803d4e2b988811c57bb81e20a043bf7b76c56aa2b7a333c7bded7a6e0bae' 
  AND token = '6v6/9UM+yS0P0bHB344HIfd2wKTEB9kPN/8uM0LHL9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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