SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fb2d8759a42f450713678e6dcc47b62b166d58c653579a951691dc291b78f7e' 
  AND token = 'OP56To+bphFsfJvmO2nHkO1pxtK+7H1k4fC7jsqZF8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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