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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55a24a43456aed06481ecbe02bea7f6f04daf1961facbe0f905c777250d9b27e' 
  AND token = 'r6H/qrBCf6nNFNYJjm63oftbGDZV+5qMmcSGR6tdPa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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