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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58a91f6080be6d205c5de6bf44e4998c9a6e753d665a9bb3b8fd98b081ebb1f9' 
  AND token = 'gwSjp6ZzFt/7tq8oEAjcUCB0Qu9TZTgxovmwaxNZMCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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