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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5344e69ed62f5e40cdb12de52ad905d0365edfaa05ed2354a69ee9d5b4f09b11' 
  AND token = 'm9MkadZnQvJPVuNvph1P/4OjrHKInCZEscAypAyAfB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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