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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40c29e283326b09e2d8c7bd0d490449279f7148611d346f90f940f234de4a235' 
  AND token = 'k6+SJJ8bzhuhFE2ycaWTihCh1ccEuzkV9zp3JXY8Wsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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