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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cc678de606761d63d484ae0ddcd8c3b0358a5604b4b8ab13534a937f82e7049' 
  AND token = 'KO0XhhcjW1ObMSqqR3zkCSM3/pkuqXwAg79hgIQzoM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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