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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1f78c273292f412300813312ef464dbc55548295d909cace165d9e849a6a11a' 
  AND token = 'O6C5iKoUt5TgWVKqgKa1trw2yXL5Pp+UmHW70OfRFJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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