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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '267502e6de851f42e8a988984c20a5a8641d67303ad9842a3976fa021dab565d' 
  AND token = 'sAw4PkvSn4CbWPCslBvFh8IU7ur031iJlnJXJcMFLJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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