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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a939221017d2768b9458b7c1ace5846e8a329bd96c9329f55beb6e01460106d' 
  AND token = 'yJhK8TyF3nuX4K693iUNmbRWD2Tbk/kBMYfsv2jLOxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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