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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f9add837db08d6e0a1b40f5a056f8e62be333a1b70d5a9950bf2ae5a5e48cea' 
  AND token = 'nZfQEU/InDfkOR+lPp+TbAjuo+9CPzu/thMQ9ByiOlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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