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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46c4e26368d92b308935df3238d9177ddd06472ee7ae01058ff367a2f93f66c0' 
  AND token = 'YkK4w+sohkLNJSUeGwe9DpRk6/N+N9dVd5/NrKy6Qp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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