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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49fe06b41bfd3ac57e61647bf6cba53b185eaf5380242e5fc7bb9a6589082d60' 
  AND token = '4ffwEgc9gVK3EOSu+lajaFRv/MOnnzwxe7AVFre5l6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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