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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9deb1e5594754d293695c16cfef247f2c2402ab34300bec57157cda954c5227d' 
  AND token = 'FALFFh/Jtt56STzm6296Hk/twSG4Ah2XzngtiPpoVTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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