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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '647ae8e54bae4141675efc23de56c64c64771db0e6434bef6d2b06241aa79c84' 
  AND token = '33UbWA22CuhncN/p3avxwlmVyJJG7B4btqL+nck70+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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