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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57c5b07b24e31f32aa219a6637e73280142e5ba9aa58e01bbdc97e254afeb2cd' 
  AND token = '3ZYLiJv0JBqBdTQ0P3tWPKrvCKWJrpO29SJnoDu/d+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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