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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b38deb98161abb89f0e1909545e76f4cb39e3cd504e9ac6522227f97ec1cbeeb' 
  AND token = 'qTVSRtsmQSAPWmnSq80hSgFVjL3uPNNYC9LXX9TiEss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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